Slick stuff
Great game, really addicting. There are just a few minor flaws that keeps this from perfect:
-From about wave 40 it gets waaay too hard. Al those tons of big monsters, really hard too keep them all away from you long enough to kill all of them. They are very very strong too.
So i keep dying and dying, trying not to train anyone. Training is expensive and they die pretty quickly with all those monsters bashing them; I'd rather save up for better armor or weapons.
In the first and last several waves, the barricades are broken within like 5 seconds, everywhere. With maximum upgrades from like wave 30-35.
Archers are completely useless. They just wait in the middle of the castle (instead of shooting off the monsters breaking the barricades) and die quickly when barricades are broken and monsters fight them.